ENPE 523_Lecture 2 - Fluid Properties.pdf

ENPE 523_Lecture 2 - Fluid Properties.pdf - Introduction to...

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Introduction to Reservoir Engineering ENPE 523 Hassan Hassanzadeh EN B204M [email protected]
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Learning objectives describe various properties of reservoir fluids and utilize these properties in common reservoir engineering calculations. 2
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Reservoir fluid properties classification of reservoirs fluids density gas compressibility factor gas formation volume factor isothermal gas compressibility gas viscosity oil gravity gas-oil ratio 3 oil formation volume factor isothermal oil compressibility oil density oil viscosity surface tension water formation volume factor gas solubility in water brine viscosity water isothermal compressibility
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P-T Diagram Cricondenbar Critical point Pr Liquid 4 Cricondentherm Quality lines ressure Temperature Gas 5% 50% 70% 90% 100% 30% Two-phase
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Oil Reservoirs Properties exhibited by the crude oil, including physical properties, composition, GOR, appearance, and Critical point Undersaturated oil reservoir 5 • Ordinary black oil • Low-shrinkage crude oil • High-shrinkage (volatile) crude oil • Near-critical crude oil pressure-temperature phase diagrams. Pressure Temperature Saturated oil reservoir
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Gas Reservoirs critical point GOR: 60000-100000 API: above 60 Color: Liquid is water-white wet gas GOR: above 100000 API: GOR: 8000-70000 SCF/STB API: above 50 Color: Liquid is water-white retrograde gas reservoir 6 • Retrograde gas-condensate • Near-critical gas-condensate • Wet gas • Dry gas Pressure Temperature Two-phase dry gas Color: Reservoir
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n = number of moles of gas, lb-mole Properties of natural gases ZnRT pV = p = absolute pressure, psia V = volume, ft 3 T = absolute temperature, ° R volume Ideal volume Actual = Z 7 R = the universal gas constant which, for the above units, has the value 10.730 psia ft 3 /lb-mole ° R ZRT pM V m M ZRT
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